The System Cabling for S7-300/400 and ET 200M

SIMATIC TOP connect offers two cabling systems for efficient wiring of the input and output module of the SIMATIC S7-300/400 and ET 200M: The fully modular connection for fast and clear connection with the sensors and actuators in the field as well as the flexible connection for easy connection within the control cabinet.

Fully Modular Connection

The fully modular connection using the modular principle consists of front connector modules, connection cables and connection modules. Thereby the wiring work is reduced and sources of error, which can arise from polarity reversal at the front connector and at the terminal strip in single wiring, are avoided. Furthermore, connection modules with signal adaptation eliminate additional costs, since the wiring of further components is completely omitted, e.g., for individual coupling relays. The uniform and clear connection diagram reduces the test times and – in case of an error – facilitates the troubleshooting. By employing standard components, the configuration also becomes quicker and easier. The slightly higher material costs are more than compensated for by the time savings.


Advantages at a glance

  • Fast and cost-efficient wiring

  • Reduction of wiring errors and test times

  • Clear control cabinet wiring

  • Supply voltage with digital and analog signals flexibly connectable at the front connector module or at the connection module

  • Control of 24 V loads up to 4 A and up to 500 Hz possible

  • In case of defect, quick and easy replacement of each individual component thanks to modular system design

Here you can find additional information and ordering options for the individual components of the fully modular connection of SIMATIC TOP connect.

Front connector module

Connecting cables

Terminal blocks

Flexible Connection

The flexible consists of clearly bundled single cores, which are already wired at the front connector. With a core cross-section of 0.5 mm², higher currents can also be carried.

The individual cores can be routed to any element in the control cabinet – quickly, easily and flexibly. Since each core is clearly marked – by a printed number corresponding to the connection point of the module – there are no more mix-ups.


Advantages at a glance

  • Individual cores can be directly routed to each element in the control cabinet

  • Reduction of the wiring work through simple plugging in of the pre-assembled cable into the I/O module

  • Higher currents possible through larger cross-section, lower voltage drop

  • Easy wiring: the number printed on the cores corresponds to the connection point at the front connector

  • Improved clarity of the control cabinet wiring through bundled single cores

  • Front connector available with screw connection as well as crimp connection

  • Selected screw connection versions available with UL/CSA-certified single cores

Here you can find additional information and ordering options for the individual components of the flexible connection of SIMATIC TOP connect.

Front connector for S7-300 (20- and 40-pole)

Front connector for S7-400 (48-pole)